# CVE-2026-36910: Aleksoid1978 MPC-BE access violation in BaseSplitterFile::Read

Source: https://junglewise.ai/threats/cve-2026-36910-aleksoid1978-mpc-be-access-violation-in-basesplitterfile-read  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-01. Updated: 2026-07-01  
License: CC BY 4.0 with a link back

CVE-2026-36910 · Severity: info · CVSS 5.5 · Published 2026-07-01

MPC-BE is a popular open-source media player for Windows. A vulnerability in how the player processes MP4 video files could allow an attacker to crash the application. To exploit this, an attacker would need to trick a user into opening a specially crafted, malicious video file, resulting in a denial of service.

Technologies: [Aleksoid1978 MPC-BE](https://junglewise.ai/threats/technologies/mpc-be). Vendors: [Aleksoid1978](https://junglewise.ai/threats/vendors/aleksoid1978).

## Quick answers

**Is CVE-2026-36910 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-36910 being exploited in the wild.

**How severe is CVE-2026-36910?** Informational severity, with a CVSS score of 5.5, published 1 July 2026.

**Which products and versions are affected?** Aleksoid1978 MPC-BE before commit 4341cb3.

**Is there a fix for CVE-2026-36910?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-36910 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-36910?** Check whether you run Aleksoid1978 MPC-BE at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An access violation exists in the CBaseSplitterFile::Read function within MPC-BE's MP4 splitting logic. The vulnerability is triggered when the application attempts to parse a malformed MP4 file containing a crafted AP4_UrlAtom, leading to an invalid memory access (access violation) during a memcpy operation. This issue stems from upstream vulnerabilities in the Bento4 library integrated into MPC-BE. An attacker can achieve a denial of service (application crash) by providing a malicious MP4 file that the user must manually open. The issue was addressed in commit 4341cb3.

## Affected products

- Aleksoid1978 MPC-BE before commit 4341cb3

## Timeline

- 2026-07-01: disclosed
- 2026-07-01: advisory

## References

- [https://github.com/Aleksoid1978/MPC-BE/issues/1062](https://github.com/Aleksoid1978/MPC-BE/issues/1062)
- [https://github.com/axiomatic-systems/Bento4/issues/873](https://github.com/axiomatic-systems/Bento4/issues/873)

## Related threats

- [Aleksoid1978 MPC-BE NULL pointer dereference in AP4_AtomSampleTable](https://junglewise.ai/threats/cve-2026-36912-aleksoid1978-mpc-be-null-pointer-dereference-in-ap4)
- [Aleksoid1978 MPC-BE division by zero in CStreamSwitcherOutputPin](https://junglewise.ai/threats/cve-2026-36911-aleksoid1978-mpc-be-division-by-zero-in-cstreamswitcheroutputpin)
- [Aleksoid1978 MPC-BE NULL pointer dereference in AP4_TkhdAtom::GetTrackId](https://junglewise.ai/threats/cve-2026-36909-aleksoid1978-mpc-be-null-pointer-dereference-in-ap4-tkhdatom)